Thomas lamb



(No Model.)

T. LAMB.

SEWING MACHINE.

Patented Oct. 6, 1885.

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Unirse @raras Parent @trice THOMAS LAMB, OF PHILADELPHIA, PENNSYLVANIA.

SEWING-MACHINE.

QEJECEFECATEQN forming part of Letters Patent No. 327,800, dated October6, 1885. Application tiled September 6, 1884. Serial No. 142,360. (No molel.)

To @ZZ whom it may concern.-

Be it known that I, THOMAS LAMB, a citizen of the United States,residing in the city and county of Philadelphia, State of Pennsylvania,have invented a new and useful Improvement in SewingdlIachines, whichimprovement is fully set forth in the following specification andaccompanying drawings, in which@ Figure l represents a side elevation ofa sewing machine embodying my invention. Fig. 2 represents a top or planview of a por tion thereof'. Fig. 3 represents a vertical section inline x :0, Fig. 1.

Similar letters of reference indicate corresponding paris in the severalgures.

My invention consists of a novel manner of connecting a sewing-machineneedle with the operating -arni thereof, a needle bar being avoided.

It also consists of a guide for the needle, the saine being adjustablerelatively to the wear of the needle and guide, and causing the needleto move true at all times.

It also consists of a novel tension device.

Referring to the drawings, A represents a cloth-plate of asewing-machine; B, the g0oseneck or arm rising therefrom; and C the armwhich is pivoted to the arm B, and has connected with it at one end theneedle D and at the other end the arm E, the latter being provided witha yoke, F, which encircles an eecentric on the driving-shaft G of themachine, wherehy motion is imparted to the arm C, and consequently tothe needle. I do not, however, limit myself to the means shown foroperating said arm C, as the same forms no part ofthe present invention.

In. the front end of the arm C is a boss, II, which extendshorizontally, and receives through its open end an oscillating cylinderor block, tI, in which latter is a vertical opening or perforation, o',for the insertion ofthe needle D, it being noticed that the top andbottom of the boss II are slotted at places coinciding with theperforation a, the top of the needle passing through or into the upperslot of the boss, and the portion of the needle below the block, Jpassing through the lower slot thereof. In order to secure the needle tothe block .I a screw, l, is passed through the end of said block andtightened against the needle,

the latter having a notch or shoulder, c, which serves to seat the pointof the screw properly on the needle. As the needle projects into andthrough the slots of the boss displacement ot' the block J andconsequently of the needle is prevented, said slots also permitting thelocation of the needle through the block from above. The withdrawal ofthe needle and block is, however, readily accomplished by removing thescrew K, so that the needle may be disconnected from the blocl; and thelatter from the boss without disturbing the other parts of the machine.

Connected with the lower end of the arm B, at the needle end thereof, isa guide, L, for the needle, the same consisting of a piece of metalvertically divided or split, forming expansible jaws d d, the innerfaces whereof are vertically grooved to receive the needle. A screw, M,is iitted to the guide and passed through the two jaws, whereby the jawsmay be readily closed and opened relatively to requirements.

It will be seen that when power is applied to the machine the arm G isoperated and the needle D advanced and returned. As the needle is guidedby the piece L the block J oscillates in the boss H, and thus the operation of the needle is accomplished with but few parts and littlefriction. It will also be seen that I employ a lengthened needle andavoid a complicated needle-bar, the needle itself being guided on thearm B by means of the piece L. Vhen the needle or the grooves in thejaws d, or both, are worn, the screw M is properly rotated, thus closingsaid jaws and moving them nearer to the needle, whereby the latter maybe guided t-rue in a right-line direction at all times.

For the purpose of producing a proper tension of the thread, I employ aneye, N, and a lip, I), which are on the end of the arm C on oppositesides of the boss II. A bent springarm, Q, is connected with the arm B,and has its outer end or limb free and parallel with the boss H, or atan angle to the eye N and lip I). Then the thread leaves thefriction-disk It of the machine, it is passed around the end of the armQ, then twisted around the needle D, then passed between the lip I) andarm C, next through the eye N, and thence directed t-o the eye of theneedle.

By this provision the thread is nicely given out as required and tightlyheld at the proper time, the tension .thus being uniform andreliable,the degree of tension being adjusted by the disks R and the extent oftwisting or wrap` ping of the thread aroundthe needle.

Having thus described my invention, what I claim as new, and desire tosecure by Let-ters Patent, is-

l. A needle-Carrying arm provided with a boss, an oscillating block ttedin said boss, and a serew connected with said block, the boss beingslotted at top and bottom, and the block perforated at coincidentplaces, whereby the needle may be passed through the boss and block andconnected with-the block by said screw, and whereby the needle mayprevent displacement of the block, all of said parts being arranged andcombined substantially as and for the purpose set forth.

2. In a sewing-machine, a needle-carrying arm in combination with a bossslotted at top and bottoni attached to said arm, and a block having aperforation adapted to osoillate in said boss and be retained therein bythe needle, substantially as and for the purpose set forth.

3. In a sewing-machine, the arm B, in eombination with the pivoted armC, provided with boss H, having upper and lower slots, blook J, havingperforation a, a needle having a shoulder, c, screw K, guide L, havingjaws d d, and screw M, substantially as and for the purpose set forth. y

4. In a sewing-machine, a needle in oolnbination with a needle-carryingarm, C, provided with the boss H, having the eye N and lip P, the arm Q,and friction-disk R, substantially as and for the purpose set forth.

- THOS. LAMB. Vitnesses:

JOHN A. VIEDERsI-IEIM, A. P. GRANT.

